[Bug bootstrap/50461] mpfr.h found in mpfr-3.1.0/src instead of mpfr-3.0.1/. as previously

[nickc at gcc dot gnu.org]

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=50461

--- Comment #16 from Nick Clifton <nickc at gcc dot gnu.org> ---
Oops - forgot to mention - the patch is present in gcc 4.8.0 and later.